Effects of alkaline or liquid-ammonia treatment on crystalline cellulose: changes in crystalline structure and effects on enzymatic digestibility

Table 1 Crystalline (cellulose I or cellulose III_I) and amorphous cellulose contents (measured by XRD) of samples prepared from Avicel PH 101 after ammonia treatment at different final temperatures

Sample number - Figure 2	NH₃treatment conditions	Amorphous content (%)	Cellulose allomorphs (CI, %)		Crystallite size (Å)
			I	III_I
(g)	Control^a	26	74 (1.2)	-	46 (1.1)
(f)	-33°C	57	-	43	20
(e)	25°C^b	46	-	54	38
(d)	25°C	36	-	64	42
(c)	105°C	35	-	65	49
(b)	130°C	26	-	74	55
(a)	140°C	22	-	78	57

^aValues for control (Avicel PH-101) were measured three times and the numbers in parentheses indicate the standard deviation; ^bNH₃ treatment at 25°C for 5 min. CI: crystallinity index; XRD: X-ray diffraction.

ISSN: 2731-3654